6.4L Power Stroke Engine and DrivetrainDiscussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008 Super-Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.
The way I do it is in this order:
1. Drain the fuel / water seperator and open the upper filter lid
2. Unscrew the lower (frame rail) filter lid and remove the old filter
3. Remove the upper filter lid and filter cartridge
4. Replace the upper cartridge and torque it
5. Replace the lower cartridge and replace it, torque it
6. Prime the fuel system
This minimizes the amount of fuel spilt. Make sure you move the bundle of wires Ford decided to put right by the nut on the plastic lid on the fame filter lid. It is tight, but can be moved out the way just enough...but the filter still comes out at an angle.
This may be a dumb question but do you drain the fuel / water seperator completely? I will be changing the fuel filters for the first time this weekend....
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2008 F250 6.4L 4 X 4 (Job 1) Crew Cab Lariat Shift on the fly, 3.73 White w/ medium stone leather interior, Banks 4" Single Monster Exhaust, Billet front and side grilles, XM Radio, Rhino Liner...
Yes, you do. The first time I changed them I did not do that, and fuel went everywhere. I thought I would drain the tank empty or something. Unless I got lucky or am missing something, it makes taking off the frame rail filter much easier.
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2008 F250 6.4L 4 X 4 (Job 1) Crew Cab Lariat Shift on the fly, 3.73 White w/ medium stone leather interior, Banks 4" Single Monster Exhaust, Billet front and side grilles, XM Radio, Rhino Liner...
Before following all of those (correct, by the way) steps, put the rear wheels slightly higher than the front. Remove your fuel tank fill cap and let it stand for 20 minutes or so. This minimizes the amount of LIQUID FRICKIN' GOLD lost when you drain the separator. This is an old 6.0 trick, but it should work on new rigs as well.
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Red 2002 F-350 XLT SRW 4x4 7.3L reg. cab 6-speed rubber floors traded at 50K for:
Red 2005 F-350 XLT SRW 4x4 6.0L reg. cab 6-speed rubber floors BFG 12.5x35 mud-terrains, no lift traded for:
Red 2008 F-350 XLT SRW 4x4 6.4 reg. cab 6-speed. Got carpet this time- audiophile stereo deletes rubber floors. BFG 12.5x35 mud terrains, no lift.
The way I do it is in this order:
1. Drain the fuel / water seperator and open the upper filter lid
2. Unscrew the lower (frame rail) filter lid and remove the old filter
3. Remove the upper filter lid and filter cartridge
4. Replace the upper cartridge and torque it
5. Replace the lower cartridge and replace it, torque it
6. Prime the fuel system
This minimizes the amount of fuel spilt. Make sure you move the bundle of wires Ford decided to put right by the nut on the plastic lid on the fame filter lid. It is tight, but can be moved out the way just enough...but the filter still comes out at an angle.
Good luck.
Great post. Just changed my filters without a hitch.
Notes:
27 NM = 20 lbs-ft
You'll need a 1 3/8" socket/wrench. A 36mm works as well. Had one from doing oil changes on euro vehicles.
Also helps to move the steel line that runs right next to the water separator. Just a plastic clip holding it close tot he frame rail.
Since were on the subject, my OM says change the filters 20K miles or two years which ever comes first. Seems like a lot of miles to me. How often do you guys change your fuel filters?
Since were on the subject, my OM says change the filters 20K miles or two years which ever comes first. Seems like a lot of miles to me. How often do you guys change your fuel filters?
Why would that seem like a lot? If it's your daily driver and you drive the national average, you'll change it in less than 1.5 years. I've only got 7k miles on my truck, but I plan on adhering to the manual so that there aren't any issues with warranty. As long as you're UNDER or AT the manufacturer specified maintenance intervals, you won't have problems. If you want to pad the pockets of Ford, change your fuel filters more often! :-D
Actually, I think I already know the answers you're going to get. "I change mine every 10k miles" or "If you use an additive, you can get away with going longer without changing your filters" or "depends......."
I stress the wait 20 minutes for the fuel system to drain. I didn't wait long enough and got a little diesel bath. Ruined a shirt and I had to take a good shower to get the diesel smell off me!
Also I think it would help to wipe the interior of the fuel water separator out to clean out the garbage. My separator had lots of gunk in it.
__________________ 2008 F450 DRW CC LWB 4x4 Off Road, Lariat, Oxford White, 4.30 LS rear end, Navigation, audiophile stereo, Memory package seats, heated seats, heated mirrors, warmup heat option power back window, traction control system, backup alarm, rear DVD with wireless headphones.
Since were on the subject, my OM says change the filters 20K miles or two years which ever comes first. Seems like a lot of miles to me. How often do you guys change your fuel filters?
Dealer told me to do it at 10000 miles.
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2008 F350 FX 6.4PSD 4X4 AUTO SC, TRADED 2000 F350 LARIET LE 4x4 PSD,AUTO,CC,RWD,AIS,4" MAGNAFLOW EXHAUST, PILLAR,PRYO,BOOST,TRANNY GAUGES,6.0 TRANNY COOLER
If you fall under any of the conditions that are listed as severe operation, then you are supposed to change your fuel filters every 10,000 miles. Those conditions are;
Frequent or extended idling (over 10 minutes per hour of normal driving)
If vehicle is operated in sustained ambient temperatures below -23°C (-10°F) or above 38°C (100°F)
Towing a trailer or using a camper or car-top carrier
Frequent driving at low speeds, consistent heavy traffic less than 25 mph (40 km/h) and/or rush hour traffic
Driving in dusty conditions such as unpaved or dusty roads
Off-road operation
Use of biodiesel, up to and including 5 percent biodiesel (B5)
I stress the wait 20 minutes for the fuel system to drain. I didn't wait long enough and got a little diesel bath. Ruined a shirt and I had to take a good shower to get the diesel smell off me!
Also I think it would help to wipe the interior of the fuel water separator out to clean out the garbage. My separator had lots of gunk in it.
I tried this today and I got a diesel bath...its like the fuel kept coming from the tank. The last time I changed filters, I had very little come out, because I followed the directions I typed above. Today was not so smooth. Taking the fuel tank cap off seemed to make it worse...and I also had the rear wheels higher because I also did a 4 tire rotation today too. I think I lost close to a gallon of diesel including draining the seperator before unscrewing anything.
2008 F450 DRW CC LWB 4x4 Off Road, Lariat, Oxford White, 4.30 LS rear end, Navigation, audiophile stereo, Memory package seats, heated seats, heated mirrors, warmup heat option power back window, traction control system, backup alarm, rear DVD with wireless headphones. 
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